The WiGear iMuff BT headphones work with the iPhone. The dongle transmits stereo AND mic functions (mic is built into the headphone) and controls work (dongle plugs into the docking port instead of the headphone jack). It would obviously be even nicer if Apple would enable A2DP, but in the meantime, this device offers the same functions. I haven't ordered this thing yet, but I spoke with a tech rep at WiGear who uses it with his phone and said that, while you will get the usual airplane mode response, it works fine.
The biggest caveat is that the dongle draws power from the iPhone, but for wireless workouts, etc, it would be great!